For a fishing trip we normally camp right inbetween Cathedral and Dundeburra. Close to the Cathedral shop and the Dundeburra showers. There have been a few decent gutters to fish in close to Dundeburra the last few years also. There are quite a few good flat spots and the occasional small tree for a little protection.
If with the missus, we camp at Dundaburra. Toilets + showers = less whinging.
Enjoy your trip